Lightweight heat sink



FIG. 1 is a top perspective view of the ornamental design of the lightweight heat sink.

FIG. 2 is a top view of the ornamental design of the lightweight heat sink.

FIG. 3 is a bottom view of the ornamental design of the lightweight heat sink.

FIG. 4 is a front view of the ornamental design of the lightweight heat sink.

FIG. 5 is a back view of the ornamental design of the lightweight heat sink.

FIG. 6 is a right side view of the ornamental design for the lightweight heat sink, the opposite side view being a mirror image thereof; and,

FIG. 7 is a bottom perspective view of the ornamental design of the lightweight heat sink. 

CLAIM The ornamental design for a lightweight heat sink, as shown and described. 